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Finding the Fourth Proportional to 1,140.61, 1,711.02 and 447.23

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Solution

The fourth proportional to 1,140.61, 1,711.02 and 447.23 is: 670.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,140.61 : 1,711.02 = 447.23 : x
  2. Step 2: Convert to fraction form
    1,140.61/1,711.02 = 447.23/x
  3. Step 3: Cross multiply
    1,140.61x = 1,711.02 × 447.23
  4. Step 4: Simplify right side
    1,140.61x = 765,219.47
  5. Step 5: Solve for x
    x = 765,219.47/1,140.61
  6. Step 6: Final answer
    x = 670.89

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.